双运行模式复叠制冷机的实验研究及优化

EXPERIMENTAL STUDY AND OPTIMIZATION OF A DUAL MODEL CYCLE FOR CASCADE REFRIGERATOR

提出了一种新型的带中间回热器的双运行模式复叠制冷循环,搭建了相应的复叠制冷循环低温预冷设备实验台,通过初步的实验研究验证了该制冷机的可行性,并对实验数据进行了理论分析,提出了改进系统性能的措施:提高回热器效能,优化系统压缩比,强化冷凝器换热,合理控制单位质量制冷量,在冷凝蒸发器进出口加旁通管路等。通过理论计算表明实验台可通过改进达到较高的性能系数,说明了该制冷机具有很好的发展前景。

A new cascade refrigeration cycle has been proposed,which can operate in two models with an internal heat exchanger employed in the low-temperature cycle to recycle the cooling.The corresponding refrigerator apparatus was been designed and built.The feasibility and performance of the cascade refrigeration cycle were investigated through experiments.Detailed suggestions were put forward to improve the system performance on the basis of experimental data,such as increasing the efficiency of regenerator,optimizing compression ratio,enhancing the heat-exchange of condenser,optimizing the cooling output by the evaporator,and adding a bypass between the condenser-evaporator＇s inlet and outlet.The COP of the improved cycle is enhanced, which showed the dual model cycle for cryogenic refrigerator is feasible and has a promising foreground.